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R. HOFFMANN` ARRANGEMENT 0F WHEEL GEARINGS Foa ELECTRICALLY DRIVENVEHICLES.

menasept. 30,1919.

2 sHEEIs-SHEET l.

APPLICATION FILED FEB. 2l, IBIS.

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H. HOFFMANN. ARRANGEMENT OF WHEEL GEARINGS FOR ELECTRICALLY DRIVENVEHICLES.

y APPLICATION FILED FEB. 2|,1919. l ,3 1 7,499 Patented Sept. 30, 1919.

2 SHEETS-SHEET 2.

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NTED STATES PATENT QFFCE.

RUDOLF HOFFMANN, OF ROMANSHORN, SWITZERLAND.

ARRANGEMENT OF WHEEL-GERINGS FOR ELECTRICALLY-DRIVEN VEHICLES.

' Application filed February 21, 1919.

To all whomz't may concern:

Be it known that I, RUDOLF HOFFMANN, a citizen of the Republic ofSwitzerlandj residing at Romanshorn, Neustrasse 953, Switzerland, haveinvented certain new and usefull Improvements in Arrangements of WheelGearings for Electrically Driven Vehicles; and I do hereby declare thefollowing to be a clear, full, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use; the same, reference being had to the accompanyingdrawings, and to lettersor figures of reference marked thereon, whichforma part of this specilication.

This invention relates to improvements in the arrangement Vof thetoothewheel gearingsy for the motors of electrically driven vehicleswhich have an electric motor foreach driving axle and in which the axleof each motor is kept in a true parallel position relatively to theappertaining driving axle.

The characteristic feature of the arrangement according to thisinvention consists in that two pairs of toothed wheels, which areprovided in connection with each driving axle for the purpose oftransmitting to the latter the tractive Vpower generated by theappertaining motor, are placed on the outside of the two driving wheelsthat are mounted on the same driving axle in order that sufficient spacemay be obtained between the driving wheels for the placing of a motor ofsuiiicient power to allow to make full use of all the adhesive weightthat can be got on to the'drivingy axle of a heavy locomotive or fullloaded car.

In the fewcases `known heretofore where a double sided drive isprovided, the gear wheels were located either on the inside of thedriving wheels, thus leaving little room forthe motor; when arrangedoutside, they were attached to the main-vehicle-frame, their axes `beingthereby (on account of the working of the bearing springs) not always lkept parallel to the appertaining axles and being not always at the sameheight with it,'so that they had to be connected to theml and have todrive them by means ofy intermediate universal joints and links andsprings heavily loaded and constituting ak great encumbrance and givingrise to much additional wear and tear.

As pointed out above, the known arrangements of toothed wheel gearngsarranged Specification of Letters Patent. Patented Sept. 30, 1919.

Serial No. 278,456.

between the driving wheels of the vehicle have the drawback, that themotors can not be made, for want of space and in spite of the highnumber of revolutions, powerful enough to suit the adhesive -weight ofmainline engines.

This is also the case when the motors are placed directly around thedriving axle andv when no gearings are provided, for instance when themotors are mounted on a hollow shaft surrounding the driving axle orwhen otherwisevfixed, yas the dimensions of the motor must then be inthis case larger on account of the low number of revolutions.

The method of transmitting the power from the motor to the wheels bymeans of connecting rods as used in steam locomotives, is also notsatisfactory from the mechanical point ofy view when applied to theelectrically driven locomotives.

All said gear arrangements hitherto known therefore donot give the sameradvantages and do not interfere with the arrangement according to thisinvention which comprises a double outside wheel gearing and which is ofsuch a design that the axle of the motor and its appertaining drivingaxle are always held in a true parallel position relatively to eachother.

The use of outside double wheel gearings arranged according to thisinvention allows thus of obtaining suHicient room for a powerful motorand great simplicity in the driving mechanism for electric locomotivesand cars.

The following further advantages are attained besides those alreadymentioned: All toothed wheels can be rigidly fixed to axles supportediii-bearings of ample size and of fair distance; the axle of the motorand the driving axle can be rigidly and securely connected in proximityof the toothed wheels, so that the running of the latter is very smooth;the toothed wheels, the axles boxes and the bearings of the motor arevery easily accessible; all parts are subjected to relatively smallstrains owing to the arrangement of the bearings near the point at whichthe force or power acts and to the simultaneous subdivision of themotivepowen The new arrangement of toothed wheel-gearings rendersmoreover theA provision of any flexible couplings or of pulling linksand springs between the toothed wheels and the driving axles entirelysuperfluous so that the design is simplified.

2 l Y Y 1,317,499

This invention will now be more `particularly described withreference tothe accompanying drawiii'gawhi'oh illustrate 'constructional examples otthe invention. Inthese drawings:

Figure 1 is a sectiOIl 0n the line I-I of 2 of 'a' portion of 'the'fuiiderfrarue of a locomotive;

Fig. 2 is a corresponding plan-view, showinfgrthe main enginevframe insection @il i'sa section onf the 'line III-Eloi Figui and.

billig; 45a? sectioni on the line-IVJ-#IV of Fig. 3` throughanaxle-'boxi shown 'iin rthese figures on an enlarged scale.

A'-fliligs-.`and f6 are. views Corresponding to Figs. and'`respectively, showingA a modi,-

fifeation offtbe arrangement Villustrated in Figs. 41 and@ 2. Y

7.115; verticalvv cross-section fof' a detail o-the' f arrangementillustrated# in Figs A'5 and 6; Y Y

Figs. 'Sia-ndi) iareplanlviews, ip artly lin Iseotion;4 of a portion ofthe 4undert-rames of locbmotives; showinlg further vfniodificati'ons ofthe'- `arrangeinentaccording *to this inven tion; Y'

*Reterring at lirst'to Figs.` -1r `and 2;' 1 -rdef notes a motor1ass-urn'e'd t'o be eriti'relysymniet'niea'lv and*l 'protfide'd1y with*two' collectors giving flplentyf oli rooml for Vthe carbon brushes. Theaxle 1811615'thisniotor'carriesat botlr' *ends eq'ual "weightsf and issubjected tofiequlil strains `lorlfs't'resses.l Two' :toothed pin-ions@S'arefixedfon the motor laxle spuriwieels'e and 5 respectively;arrangeddirectly on the o-uts'i'deof"L the'twodriving two pinions 12;"3? isplaced twobearingsS, Sffgand 9*,"9 respectively; the-motor axle 18 Hi'sthlus'ffsupported in' 'four' bearings and* ihas "eonseq'uen-tly butsmall bending strains to bear. The pinion casings 10 and 1.1 withitlfife''bejari-'ngs 8,` S- and 9, 9 respectively,

aire'A connected 3Ito 'thev 'outside' axleboxes 12S lrrespe'ctivelybymea-us of vrigid*'pieces f le@ and 1.25. @Phe-housing olf ithefmoton i'is sii-ppbrtedbrsuspended' in af ln'ow-n manner orl'tjhe"'trannefontvthev vehicle by mea-nsj'of thel i liaveth-erelforesomelittle playbetween the f guides 19 and 2O respectively, or they may be providedwith sli'ding'blocksl, 21, as shown inFfigsB andlg-which ad'niit` asmall rockiiig'noveinent; thus enabling 'thev axle-boxes itofassumeinolinedfpositions between their guides;- 4

Thelfarangenieiit illustrated in Figs.' 5-7 comprises a motor 1 havingonly one collector and provided with a double sided gearing of the kindshown in Figsfl and 2. These Figs. 5-7 illustratealso another kind of.an axle box guide of whichFig. T is a vertical section on a somewhatlarger scale. `This axlebox 'gi'iide comprises pins QQand 4secu-relylfixed tothefeonnecting pieces 14 and 15 respeotively, and carryingprismatic guide blocks 24 and25srespec-tively;aelaltefll 75 tofy slidevertically "in theguidestofsuehian amount as' the 'play- "oli" thevehicle springs and of the motor springeE lww-ill require; #It isobvious, vthat this-kindi oi'guideI for ttl-ieY driving-'axle 'l andthemotor 1v 'may be lused 80 in '-conii'eetion with lHind -ofmtolf. Inplace fof'fV theA rsliding blobks' 24, '25v sllovvny in F-igs: l 5;." 6and "7; it -isl sometimes :preferred 'to user! guiding' links 26 (seeFig. TS pivoting onajpinfQZ.

lfnst'ead'4 off connecting tliel easing lof the motor hand'fthebea'r-i-ngs',v 8 and 9.5 9."toftlie axlesboxes yl2 andv -13f=xrespective-ly*of the', driving. axle 175 theniotorf axle-'1:8 :eanailsofbe connected in another manner to the driviligf'QO axle 17 `sofas'tofberkept `tol givenvdistairee and. in true parallel :positionrelatively -to l it. .y \'\llhus,V l for instance, thel easing: off themotor 1l'niay be connected=tospecialfbearings 2S;` 29 mounted'onwthedfriving axle 17 and 95 lo-cated'on -the outside ott-he drivingf'wheels6, 7 ands of the; 'gear wheels 41515 and" om the inside 'of thevdriving'axle-boxes l12`fianda`i-13 beside the latter (Fig. 91). a ,f

In fthearrangements showny in Figs:y f1? andi 100 5;; thefaxle: 1:8 oithe l-Inotor'f-is sh'ownonfba higher level than -the adriving l axle 17.1 A)'-Tliisv isv done inf `onderto renden therinotor more. easilyaccessible from .the -platorniolf# the vehicleywhenitis running.

1. Ani electrically drivenfloeomotivefor car; comprising@ electricmotors-,f1 a'vd'riving axle. in connection with each 1f1'1"oix)r.,V 1 'aipairf of 'driving Iwheels oneazohfk drivingsairlel 110 mountedIonropposit'e sides of-'the Iflatterfbearings for the drivingaxledtwgroupsfof toot'lieduwheeilsjin connectionwithfeaeh :niotor' 'adaptedfto'transmit the' iiraeti'vepower .Y generated bythe latter to.theappentaningf drivingaxle; ands means adapted?tol` '-riigidlyfc'onneotreac'hs inotorifto thebe'a'riifrgsoffthei appertainingidrivingkax'legin order-fte keep" the? latter' rin* aitmiefiparfalllelrp'ositio'n'- Helm: tvely'to'its appertanng motor;sadggneups 12o of; ttoothed ,wheels 'bei-ngl 'Varlrangedi fat'oppbsitefsides'offthevehiole on theoutsidefoglthev driving wheelslmounted ton' theffsalnel axle.:

Q Ano electrically 1 dnven locomotive toi-:1' oar,'-. comp'risi-ng'felectrie inotiorsffa "ngi 125 axle finiE oonneetion with'l eaohf motor,la pair.' or" drivin'gr wheels! onf neaeh driving v -axle mounted onopposite esidesofitlaeflatten,'tive ax'leboxes forfe aeh kdriving laxle.'i arranged on fthe f latter 'on "the "outside, oii` the i driving180j Wheels, two pairs of toothed Wheels in connection With each motoradapted to transmit the tractive poWer generated by the latter to theappertaining driving axle, said two pairs of toothed Wheels beingarranged at opposite sides of the vehicle on the outside of the drivingWheels mounted on the same axle, and a pair of bearings in connectionwith each motor connecting its casing to the appertaining driving axleand arranged on 10 the latter on the outside of the drivingwheels and onthe inside of the axle-boxes. In testimony that I claim the foregoing asmy invention I have signed my name.

RUDOLF HOFFMANN.

Copies o! this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C."

